HP 8753E Programming And Command Reference Manual page 167

These commands set the TTL output and end-of-sweep pulse:
TTLLPULS
TTLOH
HP-IB Programming and Command Reference Guide
Defines 3 bits, DO through D2, on the test
set connector I/O for the channel 1 and
channel 2 reverse settings. These bits can
be set to values of 0 through 7. Be careful
that you do not also set a value to AT"l'P1
and ATTP2 as there is interaction between
these commands and they will change
the values you have set for DO through
the following values for DO through D2:
r
Selects test port 1 or 2 for
non-S-parameter measurements.
sweep.
sweep.
Sets TTL continuously high.
Sets TTL continuously low.
Selects up converter for mixer
measurements.
I
0